Mary was sick so she didn’t go to school yesterday

She felt tired so she went to bed early

Margaret's mother was sick so she stayed at home

The test was difficult so I couldn't do it.

Khi chuyển từ because sang so thì ta sẽ chuyển vế sau because lên trước, sau đó thêm"so" và chép lại vế trước because.

Because và so có vai trò như nhau trong các câu trên

so: Vì vậy

22. Mary didn’t go to school yesterday because she was sick. (so) 
→Mary was sick so she didn't go to school.
23. She went to bed early because she felt tired . (so)
→ She felt tired so she went to bed early.
24. Margaret stayed at home because her mother was sick. (so)
→ Margaret's mother was sick so she stayed at home.
25. I couldn’t do the test because it was difficult. (so)
→ The test  was difficult so I couldn't do it.

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